Forum rules
Please help the volunteers to help you by supplying the version of phpList you are using, browser & version and if possible, a link to your phpList installation. This is for Version 2 of phpList (the orange one).

I'll add that this also applies to IE10 on Windows 7 too. While some of the little layout niggles that previous versions of IE exhibited have gone, IE10 really doesn't like the editor unless you set Compatibility Mode.